fs_mgr: Add support for MS_LAZYTIME.

"lazytime" as a mount option was removed recently in favor of
MS_LAZYTIME.  This is causing mount failures when calling
IVold::commitChanges.

Bug: 329657783
Test: cuttlefish on android-mainline
Change-Id: Id01c1e5bbd0c82e07126be65f638e16600c058e3